package com.sms.reggie.filter;

import com.alibaba.fastjson.JSON;
import com.sms.reggie.common.BaseContext;
import com.sms.reggie.common.R;
import lombok.extern.slf4j.Slf4j;
import org.springframework.util.AntPathMatcher;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

/**
 * 检查用户是否已经完成登录
 */
@Slf4j
@WebFilter(filterName = "loginCheckFilter",urlPatterns = "/*")
public class LoginCheckFilter implements Filter {
    //路径匹配器，支持通配符
    public static final AntPathMatcher PATH_MATCHER = new AntPathMatcher();

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        HttpServletRequest request = (HttpServletRequest) servletRequest;
        HttpServletResponse response = (HttpServletResponse) servletResponse;

        //获取本次请求的uri
        String requestURI = request.getRequestURI();

        log.info("拦截到请求：{}",requestURI);

        //定义不需要处理的请求路径
        String[] urls = new String[]{
          "/employee/login",
          "/employee/logout",
          "/backend/**",
          "/front/**",
          "/common/**",
          "/user/sendMsg",//移动端发送短信
          "/user/login"//移动端登录

        };
        //判断请求是否需要处理
        boolean check = check(urls, requestURI);

        //如果不需要处理，放行
        if(check){
            log.info("本次请求{}不需处理",requestURI);
            filterChain.doFilter(request,response);
            return;

        }
        //1判断是否登录,已登录放行
        if(request.getSession().getAttribute("employee")!=null){
            log.info("用户已登录，id为{}",request.getSession().getAttribute("employee"));

            Long empId = (Long) request.getSession().getAttribute("employee");
            BaseContext.setCurrentId(empId);

            long id = Thread.currentThread().getId();
            log.info("线程id为{}",id);

            filterChain.doFilter(request,response);
            return;
        }

        //2判断是否登录,已登录放行
        if(request.getSession().getAttribute("user")!=null){
            log.info("用户已登录，id为{}",request.getSession().getAttribute("user"));

            Long userId = (Long) request.getSession().getAttribute("user");
            BaseContext.setCurrentId(userId);

            long id = Thread.currentThread().getId();
            log.info("线程id为{}",id);

            filterChain.doFilter(request,response);
            return;
        }
        log.info("用户未登录");
        //没登陆就返回未登录的结果，通过输出流方式向客户端响应数据
        response.getWriter().write(JSON.toJSONString(R.error("NOTLOGIN")));
        return;




    }

    /**
     * 路径匹配，检查本次请求是否放行
     * @param requestURI
     * @param urls
     * @return
     */
    public boolean check(String[] urls,String requestURI){
        for (String url : urls) {
            boolean match = PATH_MATCHER.match(url, requestURI);

            if(match){
                return true;
            }
        }
        return false;
    }
}
